乙酸钠修复铬污染土壤的机制研究

摘要

选择乙酸钠作为农家肥中羧酸类物质的代表,在确定其对铬污染土壤修复效果的基础上,通过化学分析和红外图谱研究,探索乙酸钠与土壤中Cr(Ⅵ)之间可能存在的5种作用方式,并对其有效作用方式的机制进行研究.结果表明:乙酸钠能显著降低铬污染土壤中的Cr(Ⅵ)含量,其有效作用方式是乙酸钠和土壤中有机组分的共同作用；乙酸钠的加入使土壤有机组分中的一些不溶于水的羧酸类物质进入液相,从而促进铬污染土壤的修复.%Sodium acetate was chosen as the typical carboxylic acid materials in the farmyard manure. Based on the determination of the remediation effect of the sodium acetate on the chromium-contaminated soil, five kinds of possible ways of the action of sodium acetate on hexavalent chromium in soil were investigated by chemical and FT1R spectroscopy analyses. The results show that sodium acetate can significantly reduce the content of the hexavalent chromium in the soil, and the combination action of sodium acetate and organic components in the soil is the effective way in the remediation process of the hexavalent chromium-contaminated soil. And the remediation mechanism study shows that the remediation effect is realized by making some water-insoluble carboxylic acid materials enter the liquid phase when adding sodium acetate.